Patch Management Best Practices for Startups
Unpatched software is one of the most reliable ways into an organisation. Attackers do not need a new zero-day if a public exploit exists for a version you still run. For small teams, the key is automation and clear ownership.
What needs patching
- Application dependencies: npm, pip, Maven, Composer, Go modules and others.
- Container base images and system packages inside them.
- Servers and virtual machines: operating system and installed software.
- Self-hosted software: CMSs, wikis, CI servers, VPNs and monitoring tools.
- Network devices and appliances, if you have them.
- Employee devices: operating systems and browsers.
- Managed services are usually patched by the provider, but some require you to accept upgrades, such as database major versions.
Automate what you can
- Dependency update bots open pull requests for new versions automatically. Group minor updates to reduce noise.
- CI checks fail builds when dependencies have critical known vulnerabilities with available fixes.
- Automatic base image rebuilds on a schedule, so containers pick up patched packages.
- Unattended security updates for server operating systems, with monitoring for failures.
- Managed device updates through MDM for laptops.
Prioritise intelligently
Not every update is urgent. Use:
- Exposure: internet-facing first.
- Known exploitation: anything on CISA's Known Exploited Vulnerabilities list is an emergency.
- Severity and reachability: is the vulnerable code path actually used?
Set and follow timelines
| Category | Target |
|---|---|
| Known exploited, internet-facing | 24 to 72 hours |
| Critical or high | 7 to 14 days |
| Medium | 30 to 60 days |
| Low | Routine cycle |
Document these in your security policy for SOC 2 and ISO 27001 audits, and keep evidence such as merged update pull requests.
Make updates safe to apply
Teams avoid patching when updates are risky. Reduce the risk:
- Good automated test coverage, so updates can be merged with confidence.
- Staged rollouts and easy rollback.
- Small, frequent updates rather than large, infrequent jumps.
Watch out for end-of-life software
Once a runtime, framework or operating system reaches end of life, it stops receiving security patches. Track EOL dates for your major components and plan upgrades before they arrive.
Verify from the outside
Patching inventories can miss things: the forgotten server, the old staging environment, the one container that did not redeploy. External testing confirms what attackers can actually see.
SecurityInfinity's network agent identifies service versions across your attack surface and matches them to known CVEs, so you can confirm patches reached everything. Start free.
Frequently asked questions
How do I avoid dependency update fatigue?
Group non-security updates, auto-merge low-risk patches with passing tests, and focus human review on major versions and security fixes.
Is it risky to auto-merge updates?
For patch-level updates with good tests, usually not. Avoid auto-merging major versions without review.
What evidence do auditors want for patching?
A documented policy, records of updates applied, such as merged pull requests or patch reports, and exceptions with justification.